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Bug #11953 » nth_prime.rb

Breaking code - claytonflesher (Clayton Flesher), 01/05/2016 06:59 PM

 
class Prime
def self.nth(num)
error(num)
primes = build_primes(num)
primes.last
end

private

def build_primes(num)
primes = [2]
index = 3
until primes.size == num
if example?(index, primes)
primes << index
end
index += 1
end
primes
end

def error(num)
unless num > 0
raise ArgumentError
end
end

def example?(index, primes)
primes.each do |prime|
if index % prime == 0
return false
end
end
true
end
end
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